diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 69c8f936ad..1f73a38054 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -98,7 +98,7 @@ repos:
     hooks:
       - id: biome-format
         name: Biome format
-        entry: npx biome format --write
+        entry: npx biome format --write --no-errors-on-unmatched
         language: system
         files: ^(biome\.json|package(-lock)?\.json|nemoclaw/package(-lock)?\.json|commitlint\.config\.js|bin/.*\.js|scripts/.*\.(js|ts)|test/.*\.js|nemoclaw/src/.*\.ts)$
         pass_filenames: true
diff --git a/scripts/check-layer-import-boundaries.ts b/scripts/check-layer-import-boundaries.ts
new file mode 100644
index 0000000000..1b841ca0e1
--- /dev/null
+++ b/scripts/check-layer-import-boundaries.ts
@@ -0,0 +1,308 @@
+// SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import { existsSync, readdirSync, readFileSync, statSync } from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import ts from "typescript";
+
+type Violation = {
+  file: string;
+  line: number;
+  column: number;
+  rule: string;
+  detail: string;
+};
+
+type ImportRef = {
+  specifier: string;
+  line: number;
+  column: number;
+};
+
+const REPO_ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+const SRC_LIB_ROOT = path.join(REPO_ROOT, "src", "lib");
+const SKIP_DIRS = new Set([".git", "coverage", "dist", "node_modules"]);
+
+function toRepoPath(absPath: string): string {
+  return path.relative(REPO_ROOT, absPath).split(path.sep).join("/");
+}
+
+function isProductionTsFile(absPath: string): boolean {
+  return absPath.endsWith(".ts") && !absPath.endsWith(".test.ts") && !absPath.endsWith(".spec.ts");
+}
+
+function* walk(dir: string): Generator<string> {
+  if (!existsSync(dir)) return;
+  for (const entry of readdirSync(dir)) {
+    if (SKIP_DIRS.has(entry)) continue;
+    const absPath = path.join(dir, entry);
+    const stats = statSync(absPath);
+    if (stats.isDirectory()) {
+      yield* walk(absPath);
+    } else if (stats.isFile() && isProductionTsFile(absPath)) {
+      yield absPath;
+    }
+  }
+}
+
+function sourceFileFor(absPath: string): ts.SourceFile {
+  return ts.createSourceFile(
+    absPath,
+    readFileSync(absPath, "utf8"),
+    ts.ScriptTarget.Latest,
+    true,
+    ts.ScriptKind.TS,
+  );
+}
+
+function position(sourceFile: ts.SourceFile, node: ts.Node): { line: number; column: number } {
+  const pos = sourceFile.getLineAndCharacterOfPosition(node.getStart(sourceFile));
+  return { line: pos.line + 1, column: pos.character + 1 };
+}
+
+function collectImportRefs(absPath: string): ImportRef[] {
+  const sourceFile = sourceFileFor(absPath);
+  const refs: ImportRef[] = [];
+
+  function add(specifier: string, node: ts.Node): void {
+    const pos = position(sourceFile, node);
+    refs.push({ specifier, ...pos });
+  }
+
+  function visit(node: ts.Node): void {
+    if (ts.isImportDeclaration(node) && ts.isStringLiteral(node.moduleSpecifier)) {
+      add(node.moduleSpecifier.text, node.moduleSpecifier);
+    } else if (
+      ts.isExportDeclaration(node) &&
+      node.moduleSpecifier &&
+      ts.isStringLiteral(node.moduleSpecifier)
+    ) {
+      add(node.moduleSpecifier.text, node.moduleSpecifier);
+    } else if (
+      ts.isCallExpression(node) &&
+      ((ts.isIdentifier(node.expression) && node.expression.text === "require") ||
+        node.expression.kind === ts.SyntaxKind.ImportKeyword) &&
+      node.arguments.length > 0 &&
+      ts.isStringLiteralLike(node.arguments[0])
+    ) {
+      add(node.arguments[0].text, node.arguments[0]);
+    }
+    ts.forEachChild(node, visit);
+  }
+
+  visit(sourceFile);
+  return refs;
+}
+
+function resolveInternalImport(fromAbsPath: string, specifier: string): string | null {
+  if (!specifier.startsWith(".")) return null;
+  const base = path.resolve(path.dirname(fromAbsPath), specifier);
+  const candidates = [base, `${base}.ts`, `${base}.tsx`, path.join(base, "index.ts")];
+  const found = candidates.find((candidate) => existsSync(candidate));
+  return found ? toRepoPath(found) : toRepoPath(`${base}.ts`);
+}
+
+function isDomainFile(repoPath: string): boolean {
+  return repoPath.startsWith("src/lib/domain/");
+}
+
+function isAdapterFile(repoPath: string): boolean {
+  return repoPath.startsWith("src/lib/adapters/");
+}
+
+function isCommandFile(repoPath: string): boolean {
+  return repoPath.startsWith("src/lib/commands/");
+}
+
+function isActionFile(repoPath: string): boolean {
+  if (repoPath.startsWith("src/lib/actions/")) return true;
+  return /(^|\/)[^/]+-actions?\.ts$/.test(repoPath);
+}
+
+function isGeneratedOrRegistryCommandFile(repoPath: string): boolean {
+  return repoPath === "src/lib/commands/index.ts" || repoPath.endsWith("/common.ts");
+}
+
+function importTargetsForbiddenLayer(
+  fromAbsPath: string,
+  ref: ImportRef,
+  forbiddenPrefixes: readonly string[],
+  forbiddenActionFiles = false,
+): string | null {
+  const target = resolveInternalImport(fromAbsPath, ref.specifier);
+  if (!target) return null;
+  if (forbiddenPrefixes.some((prefix) => target.startsWith(prefix))) return target;
+  if (forbiddenActionFiles && isActionFile(target)) return target;
+  return null;
+}
+
+function addViolation(
+  violations: Violation[],
+  file: string,
+  line: number,
+  column: number,
+  rule: string,
+  detail: string,
+): void {
+  violations.push({ file, line, column, rule, detail });
+}
+
+function checkDomainFile(absPath: string, repoPath: string, violations: Violation[]): void {
+  const imports = collectImportRefs(absPath);
+  for (const ref of imports) {
+    if (ref.specifier === "@oclif/core") {
+      addViolation(
+        violations,
+        repoPath,
+        ref.line,
+        ref.column,
+        "domain-purity",
+        "domain must not import @oclif/core",
+      );
+    }
+    if (ref.specifier === "node:child_process" || ref.specifier === "child_process") {
+      addViolation(
+        violations,
+        repoPath,
+        ref.line,
+        ref.column,
+        "domain-purity",
+        "domain must not spawn child processes",
+      );
+    }
+    const target = importTargetsForbiddenLayer(
+      absPath,
+      ref,
+      ["src/lib/adapters/", "src/lib/commands/", "src/lib/cli/"],
+      true,
+    );
+    if (target) {
+      addViolation(
+        violations,
+        repoPath,
+        ref.line,
+        ref.column,
+        "domain-purity",
+        `domain must not import ${target}`,
+      );
+    }
+  }
+
+  const sourceFile = sourceFileFor(absPath);
+  function visit(node: ts.Node): void {
+    if (
+      ts.isPropertyAccessExpression(node) &&
+      ts.isIdentifier(node.expression) &&
+      node.expression.text === "process" &&
+      node.name.text === "exit"
+    ) {
+      const pos = position(sourceFile, node);
+      addViolation(
+        violations,
+        repoPath,
+        pos.line,
+        pos.column,
+        "domain-purity",
+        "domain must not call process.exit",
+      );
+    }
+    ts.forEachChild(node, visit);
+  }
+  visit(sourceFile);
+}
+
+function checkActionFile(absPath: string, repoPath: string, violations: Violation[]): void {
+  for (const ref of collectImportRefs(absPath)) {
+    if (ref.specifier === "@oclif/core") {
+      addViolation(
+        violations,
+        repoPath,
+        ref.line,
+        ref.column,
+        "actions-no-oclif",
+        "actions must not import @oclif/core",
+      );
+    }
+  }
+}
+
+function checkAdapterFile(absPath: string, repoPath: string, violations: Violation[]): void {
+  for (const ref of collectImportRefs(absPath)) {
+    const target = importTargetsForbiddenLayer(absPath, ref, ["src/lib/commands/"], true);
+    if (target) {
+      addViolation(
+        violations,
+        repoPath,
+        ref.line,
+        ref.column,
+        "adapters-no-workflows",
+        `adapters must not import command/action layer module ${target}`,
+      );
+    }
+  }
+}
+
+function checkCommandFile(absPath: string, repoPath: string, violations: Violation[]): void {
+  if (isGeneratedOrRegistryCommandFile(repoPath)) return;
+  const sourceFile = sourceFileFor(absPath);
+  let commandClassCount = 0;
+
+  function isCommandBase(expression: ts.ExpressionWithTypeArguments): boolean {
+    const text = expression.expression.getText(sourceFile);
+    return text === "Command" || text === "NemoClawCommand";
+  }
+
+  function visit(node: ts.Node): void {
+    if (
+      ts.isClassDeclaration(node) &&
+      node.heritageClauses?.some((clause) => clause.types.some(isCommandBase))
+    ) {
+      commandClassCount += 1;
+    }
+    ts.forEachChild(node, visit);
+  }
+
+  visit(sourceFile);
+  if (commandClassCount !== 1) {
+    addViolation(
+      violations,
+      repoPath,
+      1,
+      1,
+      "one-command-per-file",
+      `command files must define exactly one registered oclif command class; found ${commandClassCount}`,
+    );
+  }
+}
+
+export function findLayerImportBoundaryViolations(root = SRC_LIB_ROOT): Violation[] {
+  const violations: Violation[] = [];
+  for (const absPath of walk(root)) {
+    const repoPath = toRepoPath(absPath);
+    if (isDomainFile(repoPath)) checkDomainFile(absPath, repoPath, violations);
+    if (isActionFile(repoPath)) checkActionFile(absPath, repoPath, violations);
+    if (isAdapterFile(repoPath)) checkAdapterFile(absPath, repoPath, violations);
+    if (isCommandFile(repoPath)) checkCommandFile(absPath, repoPath, violations);
+  }
+  return violations;
+}
+
+function main(): void {
+  const violations = findLayerImportBoundaryViolations();
+  if (violations.length > 0) {
+    const formatted = violations
+      .map(
+        (violation) =>
+          `${violation.file}:${String(violation.line)}:${String(violation.column)} ${violation.rule}: ${violation.detail}`,
+      )
+      .join("\n");
+    console.error(`Layer import boundary violations:\n${formatted}`);
+    process.exit(1);
+  }
+  console.log("Layer import boundaries passed.");
+}
+
+if (fileURLToPath(import.meta.url) === path.resolve(process.argv[1] || "")) {
+  main();
+}
diff --git a/test/layer-import-boundaries.test.ts b/test/layer-import-boundaries.test.ts
new file mode 100644
index 0000000000..5a5047207c
--- /dev/null
+++ b/test/layer-import-boundaries.test.ts
@@ -0,0 +1,23 @@
+// SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import { spawnSync } from "node:child_process";
+import path from "node:path";
+
+import { describe, expect, it } from "vitest";
+
+const REPO_ROOT = path.join(import.meta.dirname, "..");
+const TSX = path.join(REPO_ROOT, "node_modules", ".bin", "tsx");
+const BOUNDARY_SCRIPT = path.join(REPO_ROOT, "scripts", "check-layer-import-boundaries.ts");
+
+describe("CLI layer import boundaries", () => {
+  it("keeps domain, adapter, action, and command layers separated", () => {
+    const result = spawnSync(TSX, [BOUNDARY_SCRIPT], {
+      cwd: REPO_ROOT,
+      encoding: "utf-8",
+    });
+
+    expect(`${result.stdout}${result.stderr}`).toContain("Layer import boundaries passed.");
+    expect(result.status).toBe(0);
+  });
+});